firewall/firewall4: provide uci-firewall

Provide uci-firewall via PROVIDES in both firewall and firewall4. This
will allow us to change the dependency of luci-app-firewall to
uci-firewall, making it possible to use it with either implementation.

Move CONFLICTS from firewall4 to firewall, to solve this recursive
dependency problem:

tmp/.config-package.in:307:error: recursive dependency detected!
tmp/.config-package.in:307:     symbol PACKAGE_firewall is selected by PACKAGE_firewall4
tmp/.config-package.in:328:     symbol PACKAGE_firewall4 depends on PACKAGE_firewall

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Reviewed-by: Jo-Philipp Wich <jo@mein.io>

package/network/config/firewall/Makefile

@@ -9,7 +9,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=firewall
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/firewall3.git
@@ -29,6 +29,8 @@ define Package/firewall
   CATEGORY:=Base system
   TITLE:=OpenWrt C Firewall
   DEPENDS:=+libubox +libubus +libuci +libip4tc +IPV6:libip6tc +libxtables +kmod-ipt-core +kmod-ipt-conntrack +IPV6:kmod-nf-conntrack6 +kmod-ipt-nat
+  PROVIDES:=uci-firewall
+  CONFLICTS:=firewall4
 endef
 
 define Package/firewall/description

package/network/config/firewall4/Makefile

@@ -26,7 +26,7 @@ define Package/firewall4
 	+kmod-nft-nat +kmod-nft-nat6 \
 	+nftables-json \
 	+ucode +ucode-mod-fs +ucode-mod-ubus +ucode-mod-uci
-  CONFLICTS:=firewall
+  PROVIDES:=uci-firewall
 endef
 
 define Package/firewall4/description